diff --git a/action.yml b/action.yml
index 2a945f3b..3ec6f730 100644
--- a/action.yml
+++ b/action.yml
@@ -32,7 +32,34 @@ runs:
   steps:
     - id: changed-files
       run: |
-        bash entrypoint.sh
+        if [[ -z $GITHUB_BASE_REF ]]; then
+          echo "Skipping: This should only run on pull_request.";
+          exit 0;
+        fi
+
+        GITHUB_TOKEN=$1
+        TARGET_BRANCH=${GITHUB_BASE_REF}
+        CURRENT_BRANCH=${GITHUB_HEAD_REF}
+
+        echo "Getting base branch..."
+        git config --local remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
+        git config --local --add remote.origin.fetch "+refs/tags/*:refs/tags/*"
+
+        git fetch --depth=1 origin ${TARGET_BRANCH}:${TARGET_BRANCH}
+
+        echo "Getting head sha..."
+        HEAD_SHA=$(git rev-parse ${TARGET_BRANCH} || true)
+
+        echo "Getting diff..."
+        echo "::set-output name=added_files::$(git diff --diff-filter=A --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=copied_files::$(git diff --diff-filter=C --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=deleted_files::$(git diff --diff-filter=D --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=modified_files::$(git diff --diff-filter=M --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=renamed_files::$(git diff --diff-filter=R --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=changed_files::$(git diff --diff-filter=T --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=unmerged_files::$(git diff --diff-filter=R --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=unknown_files::$(git diff --diff-filter=X --name-only ${HEAD_SHA} || true)"
+        echo "::set-output name=all_changed_files::$(git diff --diff-filter="*" --name-only ${HEAD_SHA} || true)"
       shell: bash
 branding:
   icon: git-pull-request